<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Bootstrap demo</title>
  <link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.3.1/css/bootstrap.css">

<body>
  <div class="container">
    <div class="row" style="background-color:red;height: 20px;">
      <div class="col-sm-4 " style="background-color: blue;height: 20px;"></div>
      <!-- <div class="col-md-6" ></div> -->
    </div>

  </div>
  <script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.3.1/js/bootstrap.js"
    integrity="sha384-kenU1KFdBIe4zVF0s0G1M5b4hcpxyD9F7jL+jjXkk+Q2h455rYXK/7HAuoJl+0I4"
    crossorigin="anonymous"></script>
</body>

</html>